Details

liblua glues the lua run time into the boot loader. It implements all
the runtime routines that lua expects. In addition, it has a few
standard 'C' headers that nueter various aspects of the LUA build that
are too specific to lua to be in libsa. Many refinements from the
original code to improve implementation and the number of included lua
libraries. Use int64_t for lua_Number. Have "/boot" be the default
module path. Numerous cleanups from the original GSoC project,
including hacking libsa to allow lua to be built almost unmodified.

Add the final bit of lua glue to bring in liblua and plug into the
multiple interpreter framework, previously committed.

Add LOADER_LUA option, currently off by default.

Presently, this is an experimental option. One must opt-in to using
this by defining WITH_LOADER_LUA and WITHOUT_FORTH. It's been
lightly tested, so keep a backup copy of your old loader handy.
The menu code, coming in the next commit, hasn't been exhaustively
tested. A LUA boot loader is 60k larger than a FORTH one, which is
80k larger than a no-interpreter one. Subtle changes in size
may tip things past some subtle limit (the binary is ~430k now
when built with LUA). A future version may offer coexistance.

I presume the commit will have Sponsored bys for Google Summer of Code, Netflix, and the FreeBSD Foundation; any others?

As appropriate, of course. In the past we've not done this, so I'll use my judgement here. Wasn't going to put Netflix's name on it because the Lua stuff was a side project to the UEFI boot stuff that Netflix was paying me for.